Ocular traces from a representative observer during the performance of the cover test.

Horizontal RE and LE positions are represented with blue and orange lines, respectively. Periods of LE occlusion are shaded in orange and periods of RE occlusion are shaded in blue. The non-shaded areas correspond to binocular fixation periods. The inset panel zooms in on the eye traces during a RE occlusion period and shows how the RE stabilizes on its heterophoric position.